Recovering silver compounds from solutions containing other silv

Details Recovering silver compounds from solutions containing other silv Recovering silver compounds from solutions containing other silv

1976-04-19

1978-05-09

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

2041571H, 96 50A, B01J 110

Patent

active

040885526

ABSTRACT:
Silver in compound form, usually silver sulfide, is precipitated from a solution containing other silver compounds, such as the complex silver thiosulfate compounds in photographic fix and bleach-fix solutions, by subjecting such a solution to radiation having an energy level of at least 4 electronvolts. The solution as received, or diluted only with water, is irradiated without adding other chemicals such as acid or alkaline compounds to change the normal pH. Ultraviolet light and high energy electrons are preferred. Penetration of the UV light or high energy electrons is improved by recycling a flowing stream and/or agitating solution.

REFERENCES:
patent: 2221163 (1940-11-01), Barnes et al.
patent: 2940828 (1960-06-01), Moede
patent: 3554887 (1971-01-01), Feehs
patent: 3786250 (1974-01-01), Huhn
Mason, Photographic Processing Chemistry, 1975, pp. 196 and 197.

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